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� f . '� . 9 <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perforation Discharges in GPM <br /> Head Perforation diameter <br /> Pressure Distibution feec inche <br /> 3.a. Select number of perforated laterals 7/32 lf� <br /> b. Select perforation spacing= feet. l.oa o.56 0.74 <br /> c. Subtract 2 ft. from the rock layer length. 1.5 0.69 0.90 <br /> Rock layer Iength <br /> -2 ft.= feet. 2.ob o.so 1.oa <br /> d. Determine the number of spaces between perforations. a Use i.o fooc single homes. <br /> Length perf.spacing= ft.= ft.= spaces b Use 2.0 feet for anything else. <br /> e. spaces+1 = perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. ��5 x ��5�_T�= perforations. <br /> g. T x�m �� = gpm. <br /> SELECTED PUMP CAPACI'TY-��SPm <br /> B.Deterntine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> �Q_feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure Soii treaanentsystem <br /> required at manifold if gravity s tem,zero. Q;°:"�a: <br /> � feet Total pipe Iengrh <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. � .- ��,aa��re�,�e <br /> Read fric on loss in feet per 100 feet from table(F-14). P'� <br /> ------- -- - <br /> F.L._ �� � ft./100 ft of pipe <br /> .... ........ . . <br /> b. Determuie total pipe length from pump to discharge '"-'""'"'-'-----'"-----"""""--' <br /> point. Estimate by adding 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chazt(F-15 feet). <br /> Equivalent pipe length-125 times pip ength= <br /> �x �.25=_�feet Friction Loss in Plastic Pipe <br /> c Calculate total friction loss by multiplying <br /> friction loss in ft/1 by equivale pipe length. � �Om�� <br /> Total friction loss= ��`�"_x�_=100=��feet pipe dia. <br /> 4. Total head required is the sum of elevation difference, Flow Rate 1.5" 2" 3" <br /> gpm <br /> special head requirements,and total friction los <br /> D + � + � �� 20 2.47 0.73 0.11 <br /> ,C� 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 6.96 2.06 0.30 <br /> � 40 8.91 2.64 0.39 <br /> TOTAL HEAD ��eet 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection bo 5.bo o.s2 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selecte� o deliver at least <br /> _.��gpm (Step A) with at least/ feet of total head (Step B). <br />